JP5667157B2 - Bridge member - Google Patents

Description

  The present invention relates to a bridge member, particularly for a precision balance.

  The precision balance technology is increasingly demanding high resolution and accuracy in measurement engineering, while at the same time, the measurement range detected by the balance is also increasing. For example, it is desirable to weigh articles having significantly different three-dimensional dimensions and weights in continuous motion, often at very high transport speeds.

  For precision balances, monolithically processed weighing cells with an integrated lever conversion device operating on the principle of electromagnetic force compensation are known. A system with a simple conversion device of this kind can currently only be used up to a weight of about 30 kg. To extend the measurement range, a more powerful magnetic system and associated high-cost equipment can be selected, or the lever mechanism conversion ratio can be increased. However, in a multiple conversion device, the resolution of the measurement system that can be detected by the last conversion lever is reduced. In addition, the production of monolithic multiplex converters is often technically expensive and often impossible due to the small design space available.

  The parallel connecting rod connection between the fixed surface and the load detector usually provided in a monolithic weighing cell is also not applicable to large loads due to its limited load resistance. In particular, it is difficult to control the torque acting on the parallel connecting rod structure when an eccentric load is applied to the load detector, which negatively affects the accuracy of the scale. Spatial enlargement of the parallel connecting rod structure is expensive, making it difficult to create an undercut between each parallel connecting rod that is wider.

  An object of the present invention is to provide a precision balance capable of weighing weighing articles having different weights and dimensions with high resolution and accuracy in measurement engineering and at the same time with low moment sensitivity.

  This problem is solved by the bridge member according to claim 1 and the balance according to claim 12.

  The knowledge that the present invention presupposes is that the force to be detected is divided into separate levers, thereby reducing the load to be received by one lever and reducing the load on each lever mechanism. Is that you can. Each force, initially reduced separately, is integrated again in a design pre-settable reduction stage where the force is weakened and fed to the appropriate force detector for evaluation ("Conversion The concept of “to do” or “to reduce” means that the lever force is accurately changed depending on the respective lever arm, and both concepts can mean either increase or reduction). A slim or flat design configuration that allows a compact structure of the scale and a plurality of scales to be arranged at a small distance from each other is also of special significance for the present invention. The lever structure between the load detector and the base section described below has the advantage of allowing a compact configuration of each component according to the invention.

  In particular, but not exclusively, the principle of electromagnetic force compensation is a consideration for converting weight forces into an electrically measurable form, so that force detectors are constructed according to such principles. It may be.

  Furthermore, the bridge member of the present invention simplifies the structure in an inventive manner because it eliminates the need for a parallel connecting rod structure conventionally provided in monolithic weighing cells. A lever that reduces or transfers the force of weight applied to the scale or its partial force is responsible for guiding the load detector along the vertical parallel lines. As a result, a pure parallel connecting rod structure can be obtained, and at the same time, partial forces of various different sizes can be reduced and integrated at different force introduction points, and measurement can be performed with high accuracy over a wide load range. A possible balance member is created. The use of such multiple bridge members, spaced apart from each other and jointly receiving the force of the weight to be measured, can also divide this total weight of force into more than two lever systems. Allowing the load per lever system to be reduced again and the scale as a whole to weigh higher loads.

  Furthermore, the bridge member according to the present invention reduces the susceptibility to corner loads (known and problematic for monolithic weighing cells with a parallel connecting rod structure). The eccentric load of the load detector that may occur will not cause torsional torque (with parallel connecting rods that no longer exist) in the bridge members located side by side. Finally, mainly or exclusively, the arrangement of the levers that find the space in the bridge member allows the creation of free space between the bridge members, so that a scale with a plurality of bridge members is between them. There is an advantage of providing design space for other components.

  The bridge member according to the invention includes levers for force transmission, by which the force of weight is reduced and / or transferred to a force detector. Furthermore, the bridge member has a substantially elongate configuration and includes a base section that extends from one end to the opposite end in a first horizontal longitudinal direction X. On the other hand, the base area is narrowed in a second direction Y, which is also perpendicular to the first direction and also horizontal. Above the base area, there is a load detector extending in the space similar to the base area. The load detector is arranged on the base section in a vertical direction with a third direction Z perpendicular to both directions X and Y. By means of a lever supported in the base area at the bearing location, the force introduced by the load detector, which can be a partial force of the weight force acting on the balance in particular, is transferred to the force detector in a particularly reduced form. Is configured to do.

  According to the present invention, the load detector acts on the first lever via the first action point, and on the second lever configured separately from the first lever via the second action point. The partial force that acts and is introduced by the load detector is split into both these levers and can be transmitted from there in the direction towards the force detector. “Direction” means the path along which the force travels from the load detector to the force detector along the physical component of the bridge member.

  Both levers are each supported in the base area via a bearing point, and in one embodiment of the invention are combined together to form a resultant force and supply this resultant force to the force detector. Thereby, a single suitably reduced force can easily be obtained from both forces introduced from the load detector to two different levers, and the force can be transferred or evaluated at the bridge member. Therefore, the formed force can be supplied to the force detector in the same amount without reducing the resultant force. As an alternative, however, it is also conceivable that the resultant force is further changed by a further lever, in particular reduced, and then supplied to the force detector in such a reduced form. As an alternative, both levers that initially receive loads from the load detector with individual forces are respectively connected to further independent levers for force reduction or force transmission, separately or after subsequent conversion stages For the first time, it may be possible to embody a combination of different lever systems.

  According to the invention, the force detector is arranged between the lower base section and the load detector in the vertical Z direction and / or for both levers connected to the load detector in the horizontal direction. Between both bearing locations. Such a setting has the advantage that a particularly compact design form can be obtained. The force detector is surrounded by and located between the lower base area and the upper load detector so that it is beyond the area of the area between the bridge member, ie between the load detector and the base area. There is an advantage that it is not necessary to arrange a force detector. There is a similar advantage to the condition selected as an alternative or supplement that the force detector is positioned horizontally and between both bearing points for the lever directly connected to the load detector . The space present in the bridge member between these bearing points in the horizontal direction is well suited to accommodate the force detector or other components of the force compensation system, so the area between each bearing point There is no need to provide a design space outside.

  This skillful arrangement of force detectors is made possible in particular by the simultaneous connection of the load detectors to two levers arranged substantially parallel to the load detectors, and these levers are further Supported by a base area configured below the detector, a design space for the components of the force compensation system can be utilized between the load detector and the base area.

  In the monolithic weighing cell known from the prior art, the parallel connecting rod structure serves to guide a load detector movable in the vertical direction as defined relative to the stationary base area, Transmission and reduction of the weight force acting on the load detector is possible via a lever structure which additionally acts on the load detector. In order to avoid such a high design cost, another preferred embodiment of the present invention is that both the first and second levers on which the load detector acts on the load detector relative to the base area. By this, it is comprised so that it may guide to a Z direction along the parallel line of a perpendicular direction. That is, both the first levers, according to the invention, replace the parallel guides known and required from the prior art and at the same time transmit the main load to be guided from the load detector to the force detector. . Such a bridging member functioning as a weighing cell has the advantage that, even during normal operation, it can be dispensed with in addition to the lever for transmitting force and forming a separate parallel guide, instead of both The functions are grouped into these levers alone. This not only reduces manufacturing costs, but also reduces the minimum dimensions of the bridge members and promotes a slim and compact preferred design.

  The embodiment of the present invention that is particularly simple and preferable for the parallel guide described above is that the lever directly connected to the load detector acts on the connecting member at a common connecting position to integrate the lever force and transfer it as a resultant force. Is configured to do. Thus, by connecting the first lever at a common connection position and selecting the lever length appropriately, the load detector introduces a vertical (which may be different) partial force along the load detector. When received, a parallel guide is received in the Z direction facing downward along two vertical parallel lines. In other words, both ends of the load detector move simultaneously downward by the same value in the vertical direction when the load detector is loaded (“moving” is used here in a virtual sense). This is because in electromagnetic force compensation, motion should be avoided or compensated (however, the lever mechanism itself has motility). This ensures a defined movement of the load detector relative to the base area that serves as the body, eliminating the need for parallel connecting rod structures that were previously sensitive to torsion that were required for monolithic scales. . Instead, the relative movement of the load detector with respect to the base area acting as a fixed surface is assured by the force-transmitting lever itself as defined along the vertical parallel lines (below, "Parallel guidance"). In this way, the lever serves a dual function. The load detector is parallel only by levers that transmit the force of the bridge member, ie, without the other design means that allow the parallel guidance described above, that is not simultaneously acting as force transmission of weight force. There is an advantage of receiving guidance. This has the advantage of simplifying the structure of the bridge member and the balance designed with it, saving time and money.

  It is preferred that the connection of both levers, where the respective lever forces are superimposed on each other to form a common resultant force, is made in the area of the connecting member arranged as a joint. This may in particular be a monolithically machined thin section where both separate levers act on one side of the thin section (eg by a coupling area arranged offset back and forth in the Y direction). On the other hand, a connecting member follows on the other side of the thin-walled portion that has not yet been divided. The connecting member further reduces the resultant force and serves as a further lever that directly follows the connecting point, which supports, for example, a force detector or a component of the position recognition system. Thereby, the bridging member has the advantage of eliminating the need for connecting members that are often arranged between two consecutive levers, reducing manufacturing costs and promoting a compact design. However, a connecting member that merely transfers the resultant force (not provided as a lever for reducing the force) acts at the connection position, and the resultant force can be transferred to the next processing.

Thus, by connecting each lever at the connecting position,
a) Two partial forces of different levers are integrated into a resultant force,
b) the levers are mechanically coupled to each other to perform the function of parallel connecting rods;
c) A direct connection to the subsequent lever is possible due to the space-saving omission of the connecting member.
There is an advantage that the structure of the bridge member and the scale designed using the bridge member is simplified, and the manufacturing time and the manufacturing cost are reduced.

  Both levers that are directly loaded by the respective load detectors of the bridge member are constructed separately or separately from each other. Here "separately" means a virtually independent lever configuration, so each lever is assigned its own support as a lever rotation point, its own lever arm, and its own force application point. Each lever is physically distinguishable and distinguishable from other levers. However, “separately” does not exclude that the lever is connected with other levers in the area of the force application point or with other areas of the bridge member (including the monolithic case). Is carried out jointly via a particularly flexible thin-walled part.

  In one preferred embodiment of the invention, all levers following either the first lever or serving for weight transmission are substantially spatially between the load detector and the base area of the bridge member. In particular, it is arranged up and down in the vertical Z direction. Accordingly, the bridge member has a slim or long shape as much as possible, and is particularly suitable for use in a multi-track type balance having two or more bridge members arranged separately from each other. For example, in a scale having two bridge members, the lever for transmitting force is substantially limited to the area of the bridge member itself, so that the area between the bridge members is another balance such as a transport device or its motor. The design space for the component has the advantage of being left free. In addition, this design space that is kept free can also be used to accommodate calibration tables and weights, electronic components, vibration sensors, acceleration sensors, and the like.

  The dimensions of the load detector or base area are suitable for simultaneously defining the outer dimensions of the entire bridge member in various projection planes. Each lever acting as a force conversion or transfer is tensioned from the projection of the base area or load detector onto such a plane, even if the projection of the lever onto the XY plane is at least in the X direction, and preferably in the Y direction. In another preferred embodiment of the invention which is arranged on the bridge member so that it does not come out, the bridge member is constructed in a particularly compact manner. That is, in a plan view of the bridge member that can substantially see the load detector, or in an inverted view of the bridge member that can substantially see the base area, The lever does not protrude to the side. Accordingly, a plurality of bridge members according to the invention can also be arranged in close proximity to each other in the X or Y direction, with a plurality of bridge members functioning as weighing cells in the minimum required space. You can also. Conversely, the area of the lever projecting laterally from the bridge member prevents such close placement, but this is avoided by the setting described above.

  In order to configure the bridge member and its lever at the same time as stably and as rigid as possible, in another embodiment of the invention, the width of some, preferably all, levers, in the Y direction, the load detector and / or Alternatively, it is configured to substantially correspond to the width of the base area. Then, the lever can utilize the entire width of the available bridge member, and can reliably transmit a large load. The bearing locations of some, preferably all, levers are also preferably arranged in the Y direction with a width in which the load detector and / or base area is arranged. In this way, the bearing portion can utilize the entire width of the bridge member for stable support of the lever. As can be seen with reference to FIG. 1, the bridge member has substantially the form of a cuboid body in which the lever and bearing points penetrate the body over its entire width, which allows for particularly simple manufacture. To. For the purpose of a slim design, the levers of the bridge members, like the load detector and the base area, preferably extend parallel to each other and extend substantially in the X direction. On the other hand, it is better to keep the lateral length in the Y direction small.

  According to the present invention, the space occupied by the bridge member is substantially defined by the load detector and / or base area outer dimensions. The load detector and the base section preferably have substantially equal outer dimensions when viewed in a vertical plan view, and are preferably located jointly up and down in the Z direction. The lever of the bridge member also preferably does not protrude laterally from the bridge member in the horizontal direction (XY) so as not to obstruct the slim design form and the closely adjacent arrangement of a plurality of bridge members of the same type. Of course, the bridge member maintains a preferred slim design when no force detectors or other electromagnetic force compensation components are protruding laterally from the bridge member. When viewed in a vertical plan view, the load detector or base member may define the maximum horizontal length of the entire bridge member, including all its levers and other components. In this case, the bridge member is ideally suited for monolithic processing, particularly on the basis of the relatively small horizontal width in the Y direction, due to the conversion lever located between the load detector and the base section. A long and slender design.

  Furthermore, the bridge member is preferably configured in the base area without a protruding region. A region is "protruding" when it enters the horizontal direction at the free end in the X direction (possibly even in the Y direction) between two materialless regions located up and down in the vertical Z direction. When providing the bearing point for the lever at its free end. The omission of such protruding regions simplifies the production of the bridge member, and the bending moment is avoided, thereby increasing the rigidity of the bridge member and increasing the accuracy of the measurement result. There is also an advantage that the design height in the vertical direction is also reduced compared to the prior art by omitting the protruding areas.

  Therefore, in order to avoid protruding material areas, the direct material coupling from one bearing location, preferably from all bearing locations, extends in the vertical Z direction according to the load detector in the X direction. Exists up to the base area. In contrast, protruding areas with bearing points have material interruptions in the vertical Z direction (cuts of monolithic material blocks that must be turned laterally to support the bearing points relative to the base area). A notch or penetration). Such a disadvantage is avoided by the construction of the bridge member described above, because the projecting area with the bearing points always undergoes some deformation under load. Instead, the bearing location is supported directly or entirely on the base area downward in the vertical Z direction, and there is no need to redirect the force applied from the lever to the bearing location, particularly in the X direction. .

  Furthermore, a particularly preferred embodiment of the bridge member is such that the first and second levers, each directly connected to the load detector, rotate opposite to each other when a vertical load occurs on the load detector. It is configured to turn in a direction. This allows a substantially symmetric structure of the bridge member and allows the aforementioned resultant force to be formed at approximately the center of the bridge member with respect to the X direction. When both levers acting on the load detector are configured to be mirror-symmetric, one lever rotates in the opposite direction to the other lever when a load perpendicular to the load detector is generated. Both of these levers are arranged as two-arm levers, and in the bridge member arranged so as to be positioned back and forth in the X direction, both other lever arms that are not under load move in the same direction. This simplifies their connection to form the resultant force described above. Such an arrangement also allows a particularly simple load detector parallel guide, as can be seen in the drawings.

  The pivots formed at the bearing locations of both initial levers (as shown in FIG. 1) are preferably located in a common horizontal XY plane. In the case of linear levers, these will be located side by side or back and forth at the same Z level, facilitating the symmetrical structure of the bridge member. It is particularly preferred that both first levers acting directly on the load detector have equal lever ratios. The common connection of both of these levers at the ends not connected to the load detector, respectively, provides an accurate parallel guide of the load detector.

  As already mentioned above, the bridge member should be as compact as possible. For this purpose, the arrangement of the levers preferably contributes in such a way that all the levers of the bridge member can pivot about pivot axes parallel to each other. The levers pivot in a common plane, or at least in a plurality of planes located parallel to each other, but not in a plane extending laterally from each other. If all the lever movements are in the XZ direction and not transverse to the Y direction, it is possible to create the entire pivot axis of the lever by notching through the monolithic object in the Y direction. it can. This also simplifies manufacturing and reduces the cost of the bridge member.

  In another preferred embodiment of the invention, the load detector and / or base area is symmetrically divided by a vertical XZ plane. That is, both members are symmetric with respect to the plane, and accordingly are configured in the same type, thereby simplifying the manufacturing. A simple notch that penetrates the monolithic material block entirely in the Y direction results in a symmetrical configuration of the load detector or base area, so that no step in the Y direction is particularly necessary. In addition to simplifying manufacturing, the symmetric configuration also allows for similar loads on each member over the entire Y width, and hence better predictable loads. In a development of this idea, at least both the first levers acting directly on the load detector and / or all other levers acting as force transfer or transfer are also substantially driven by the aforementioned XZ plane. It can be divided symmetrically.

  As already explained, a particularly slim and compact design of the bridge member is also realized by placing the force detector between the base section and the load detector. The force detector is arranged in a region between one of both levers that are directly coupled to the load detector and the base area located below it, resulting in a particularly compact design. Realized. In that case, both the first levers are preferably arranged directly below the load detector without any intermediate space, whereas these levers and the base area located below them In the meantime, the design space for the components of the force compensation system modeled on electromagnetic force compensation is kept free. In particular, a force detector is disposed below a lever that is directly coupled to the load detector, and the sensor that optically detects the lever displacement includes the other lever coupled directly to the load detector, Embodiments are conceivable which are arranged in a region between the underlying base area. This design is also particularly suitable when the two levers of the bridge member are connected to each other in the vicinity of the center to form a resultant force and possibly to provide another rearward lever, as opposed to the X direction. And to the left and right, design space not used for other levers is available as described above.

  Correspondingly, a particularly preferred configuration of the bridge member, which is simple, allows the force detector and the optical sensor to be placed on different lever arms of the same lever. The lever preferably extends through the center of the bridge member in the X direction, and the pivot axis of the lever may be disposed in the X direction near the center. The components of the force compensation system may be arranged on both arms of such a two-armed lever, in particular at its ends.

  In the same sense, the force detector and the optical sensor provided for detecting the lever displacement face each other in the YZ plane which divides the load detector or base section in the X direction (preferably symmetrically). It may be arranged on the side. The vertical plane is preferably located at a connecting position where the connecting points of both levers to be connected to the connecting member are located in the X direction. It is particularly preferred that the plane divides the load detector and / or the base area substantially symmetrically in the X direction.

  Furthermore, a particularly compact design form of the bridge member can be realized by the load detector acting on the lower surface of the lever directly connected thereto. If each lever is also supported by the base member on this lower surface, there is no need to create a thin portion or connecting point that consumes space on the upper surface of the lever, so the lever and the load detector are very close to each other. May be arranged. In that case, the joint between the load detector and the first both levers is preferred for pressure loads at thin locations because it receives a tensile load. In order to connect the lever to the load detector in the manner described above, the load detector surrounds the end of each lever facing away from the center in the X direction from the outside, both levers being It will be located substantially inside the load detector in the X direction.

  The bridge member according to the present invention can be made from an integral material block. Considered are monolithic objects made of, for example, extruded profiles or other methods, and individual levers or load detectors and base areas can also be constructed by erosion or cutting. Embodiments in which the lever ends in the Y direction with the same width as the load detector and base section can be made particularly simple. This is because the step in the Y direction can be omitted almost completely, and a substantially symmetric lever configuration with respect to the vertical XZ plane is possible. In some cases, the only exception is an area where the two levers are connected together to form a resultant force and act on the connecting member so that they are positioned one after the other in the Y direction. Mounting the components of the electromagnetic force compensation system may also require a step in the Y direction. On the other hand, it is preferable that the thin portion and the joint for connecting or supporting each lever are configured over the entire Y width of the bridge member. Thereby, on the one hand, the thin-walled portion becomes particularly stable, and on the other hand, the thin-walled portion can be configured to penetrate through the material block entirely by a simple work process, and this can be followed or preceded by the Y direction. There is no need to make a stepped step.

  The bridging member according to the invention has the advantage that it is suitable for constructing a scale for weighing, which scale should comprise at least one such bridging member.

  Next, an embodiment of a bridge member according to the present invention and a scale constructed using the same will be described in detail with reference to the drawings.

It is a perspective view which shows a bridge member. It is a perspective view of the measurement bridge comprised from two bridge members. It is a partial side view of the measurement bridge comprised from two bridge members.

FIG. 1 shows a perspective view of the bridge member B ₁ extending from left to right along the first direction X of FIG. The bridge member B ₁ has a load detector O ₁ and a base area U ₁ located substantially conjointly thereunder. The load detector O ₁ extends from the first end to the second end in the X direction. Accordingly, the base section U ₁ also extends from the first end in the X direction to the second end. The load detector O ₁ is connected to the first lever H ₁₁ via the action point at the first end. The load detector O ₁ is similarly connected to the second lever H ₁₂ via the point of action at the second end. Both levers H ₁₁ and H ₁₂ are supported against a base area U ₁ which is regarded as stationary via bearing points L ₁₁ to L ₁₂ respectively.

The load detector O ₁ , in particular, has different partial force configurations, depending on the case, via the screwing point S ₁₁ at the first end and the screwing point S ₁₂ at the second end of the load detector O ₁ . It serves as a load detector for the load to be introduced in (1).

Both levers H ₁₁ and H ₁₂ are connected together at the connecting position P to the connecting member G ₁ at the end facing away from the respective action point, located approximately in the center of the bridge member B ₁ in FIG. This is because the half forces of the levers H ₁₁ and H ₁₂ are overlapped or united at this point. The levers H ₁₁ and H ₁₂ connected to each other can be connected back and forth in the Y direction (FIG. 1) or up and down in the Z direction (FIG. 2 or FIG. 3).

The lever H ₁₁ and H ₁₂ linked by a linking position, the lever length H ₁₁ and H ₁₂ By appropriate selection of (preferably equal length), the load detector O ₁ is, S ₁₁ and especially screwing point when S ₁₂ (if different also respectively) vertical that can be introduced through the loading axis or load plate is attached to a portion force is introduced, the two parallel lines of vertical in Z direction facing downward Get parallel guidance along. The levers H ₁₁ and H ₁₂ in the bridge member B ₁ that transmit or convert force are not only transmitting and reducing lever force as a result of the weight force to be measured, but also the role of parallel guidance Also bears.

(The bridge member B ₁ can be equipped with another lever (H ₁₃ , H ₁₄ ... H ₂₃ , H ₂₄ ...) Not shown here, and the force before or after the connection by the connection member Can be transferred).

The connecting member G ₁ is also configured as a lever and, like the levers H ₁₁ and H ₁₂ , swivels clockwise or counterclockwise around the thin-walled joint LG ₁ formed in the base section U _1. This is possible and is biased by the resultant force of both levers H ₁₁ and H ₁₂ formed in the coupling position. A part of the force detector K is disposed at the first end (the right end in FIG. 1) of the connecting member G ₁ , whereby the connecting member as a consequence of the load of the load detector O _1. It is configured to compensate for the displacement of G _1. At the end of the left coupling member G ₁ facing thereto, in order to be able to detect and signal the displacement of such lever arm, the member for position detection are arranged.

As can be seen in FIG. 1, the force transmitting or reducing lever, like the force detector K, is entirely between the load detector O ₁ and the base section U ₁ , so that the bridge member B ₁ Forms a compact and slim weighing cell with parallel guides. It should also be noted here that the number of thin sections forming the joint can be reduced to a minimum by reducing the parallel connecting rod structure known from the prior art. In the example shown in FIG. 1, the bridge member is divided into two partial forces at two ends of the load detector O ₁ , and is reduced twice (stage 1: lever H ₁₁ / H ₁₂ , step 2: despite the lever arm from the connecting member G ₁ until a force detector K) is performed, it requires only little six thin points in total. Omitting the structure of connecting a joint G ₁ as a lever, instead, by direct connection with the lower connecting position the force detector K in the vertical direction, since it is also possible to omit further another thin portion The structure of the bridge member B ₁ as the weighing cell is significantly simplified.

The connecting member G ₁ connects the two bridge members B ₁ and B ₂ used in one scale to each other, and integrates the resultant force formed by each bridge member into a single force. At the same time, the connecting member V may be configured. However, the connecting member V can also serve to connect the bridge members at a post-reduction stage. At this time, the post-reduction reduction stage follows the connecting member, and the connecting member follows the connecting member. The forces introduced into the coupling member V form a sum consisting of the resultant force of each bridge member which is reduced again there. Such a case can be seen in FIGS.

FIG. 2 shows a measuring bridge W according to the invention using _two bridge members B ₁ , B ₂ (FIG. 3 shows a schematic side view of FIG. 2 as a partial view). The first bridge member B ₁ shown on the front side is integrally formed with another bridge member B ₂ on the rear side, and each load detector O ₁ , O ₂ and base section U ₁ , U ₂ are integrated so as to form an integral lower frame UR or upper frame OR. The screw points S ₁₁ , S ₁₂ , S ₂₁ , S ₂₂ provided on the upper frame OR of the respective load detectors O ₁ , O ₂ enable the connection of load plates or measuring shells and should be weighed. The article is placed on it.

In accordance with the single view shown in FIG. 1, the respective levers H ₁₁ , H ₁₂ , H ₂₁ , H ₂₂ of each bridge member are also connected to each other at the connecting position in order to form a resultant force. The connecting members G ₁ and G ₂ (G ₁ is difficult to see in FIG. 2 and not shown) are here arranged as levers for each bridge member, which levers serve as pivots at the left end. Is supported by the lower frame UR, and extends substantially in the X direction toward the right.

In the area on the right side of the weighing bridge W, each of the levers of the connecting members G ₁ , G ₂ acts on the connecting member V that connects both of the bridge members B ₁ , B ₂ , so that each bridge member is formed. The resultant force or the force further reduced by the levers G ₁ and G ₂ is introduced together into the coupling member V. The coupling member V is also configured as a lever that is supported by the lower frame UR via a bearing portion that serves as a pivot at the right end. The connecting member V is at the same time the last lever H _L which serves to reduce. The coupling member integrates the forces separately formed by the bridge members and extends to some extent in the region between both opposing bridge members in the X direction, opposite to both coupling members G ₁ , G ₂ (FIG. 2 and towards the left in FIG. 3). The last lever H _L acts on a force detector not shown in detail or acts on a component of the force compensation system.

Unlike the bridge member B ₁ shown separately in FIG. 1, both bridge members constructed jointly of the metering bridges shown in FIGS. 2 and 3 have their own force detector K attached to each bridge member. Not done. The metering bridge first integrates the forces of the individual bridge members by means of the coupling member V, which extends laterally with respect to both bridge members in the Y direction, so that the force detector is inside the metering bridge, i.e. It is preferably arranged between both bridge members. The remaining design space, which is kept free, can be used to accommodate calibration platforms and weights, electronic components, vibration sensors, acceleration sensors, and the like.

Furthermore, both first levers of the bridge member of FIG. 1 are different from those of FIGS. The latter is because the linear levers H ₁₁ to H ₂₁ are combined with or connected to the curved or bent levers H ₁₂ to H ₂₂ .

B _I: bridge subscript i is attached member G _I: bridging member i coupling member H _IJ of: lever j bridge member i
H _L : Last lever K: Force detector L _IJ : Bearing position O _I of the lever j in the bridge member i O: Load detector OR of the bridge member i: Upper frame P: Connection position S _IJ : Screw of the load detector i Stop point j
U _i : Base area UR of bridge member i: Lower frame V: Connecting member W: Weighing bridge X, Y, Z: Direction in space

Claims (11)

In a bridge member (B ₁ ), in particular for a precision balance, comprising a lever for force transmission, by which the force of weight is reduced and / or transferred to a force detector (K) The bridge member (B ₁ )
a) a base section (U ₁ ) extending along the first longitudinal direction (X) and also extending in the X direction;
A load detector (O ₁ ) disposed above the base section (U ₁ ) in a second direction (Z) perpendicular to the first direction (X) and substantially perpendicular to the first direction (X). And
b) The load detector (O ₁ ) acts on the first lever (H ₁₁ ) and the second lever (H ₁₂ ) extending in the X direction,
c) Both the levers (H ₁₁ , H ₁₂ ) are respectively supported by the base section (U ₁ ) via bearing points (L ₁₁ , L ₁₂ ) and connected to each other to form a resultant force. In such a bridge member supplying the resultant force to the force detector (K), in particular in an amount modified by another lever (H ₁₃ , H ₁₄ ...)
d) The force detector (K) is arranged between the base section (U ₁ ) and the load detector (O ₁ ) in the vertical Z direction and / or both the bearings in the horizontal direction Between the locations (L ₁₁ , L ₁₂ ) ,
e) The lever (H ₁₁ , H ₁₂ ) or the other lever (H ₁₃ , H ₁₄ ...) connected thereto acts on the connecting member (G ₁ ) at a common connecting position, A bridge member characterized in that the force of H ₁₁ , H ₁₂ ) is integrated into the connecting member (G ₁ ) and transferred to the force detector (K) as a reduced resultant force . All the other levers (H ₁₃ , H ₁₄ ...) Acting in force conversion or force transfer following both first levers (H ₁₁ , H ₁₂ ) in the direction of force flow are vertical. 2. The bridge member according to claim 1, wherein the bridge member is disposed between the base section (U ₁ ) and the load detector (O ₁ ) up and down in the Z direction. Each of the lever which acts as a force transducer or force transfer _{(H 11, H 12, H} 13, H 14 ...) , said lever (H ₁₁ to the X-Y plane, H _12, H _13, H ₁₄ ...) So that it does not protrude from the projection of the base area (U ₁ ) or the load detector (O ₁ ) onto the XY plane, even if the projection of at least the X direction, preferably the Y direction. The bridge member according to claim 1, wherein the bridge member is arranged on the bridge member, and the bridge member is kept as slim or short as possible with respect to the horizontal dimension thereof. The load detector (O ₁ ) is guided in the Z direction along parallel lines in the vertical direction by first and second levers (H ₁₁ , H ₁₂ ) relative to the base section (U ₁ ). The bridge member according to any one of claims 1 to 3, wherein the bridge member is parallel-guided. The swivel axes of the first and second levers (H ₁₁ , H ₁₂ ) formed at the bearing locations (L ₁₁ , L ₁₂ ) are located in a common horizontal XY plane. The bridge member according to any one of claims 1 to 4 . Bridge member according to any one of claims 1 to 5 , characterized in that the first and second levers (H ₁₁ , H ₁₂ ) have an equal lever ratio. An XZ plane that symmetrically divides the load detector (O ₁ ) and / or the base section (U ₁ ) is:
a) splitting both said levers (H ₁₁ , H ₁₂ ) and / or b) all other levers (H ₁₃ , H ₁₄ . The bridge member according to any one of claims 1 to 6 , wherein the bridge member is characterized. The force sensor (K) is arranged between _{one of the} levers (H ₁₁ , H ₁₂ ) and the base section (U ₁ ) in a vertical direction (Z), The bridge member according to any one of claims 1 to 7 . The force sensor (K) and the optical sensor provided for detecting the lever displacement are arranged on different lever arms of the same lever (H ₁₃ , H ₁₄ ), or the load detector (O _1). ) or characterized in that it is arranged the base area of the (U ₁₎ to the opposite sides of Y-Z plane be divided into approximately symmetrical in the X direction, as claimed in any one of claims 1 to 8 Bridge member. The bridge member according to any one of claims 1 to 9 , wherein the load detector (O ₁ ) acts on the lower surfaces of the first and second levers (H ₁₁ , H ₁₂ ). . A scale (W) for weighing, comprising at least one bridge member (B ₁ ) according to any one of claims 1 to 10 .